Heat sink



FIG. 1 is top view of a heat sink with a broken line encircling an element of the heat sink for the purpose of pointing out the location of the element on the heat sink with the element being shown in detail in FIG. 8 and with the broken line forming no part of the claimed design;

FIG. 2 is bottom view of the heat sink;

FIG. 3 is a back view of the heat sink;

FIG. 4 is a front view of the heat sink with a broken line encircling an element of the heat sink for the purpose of pointing out the location of the element on the heat sink with the element being shown in detail in FIG. 9 ;

FIG. 5 is a left side view of the heat sink;

FIG. 6 is a right side view of the heat sink;

FIG. 7 is a perspective view of the heat sink;

FIG. 8 is a top view of the element of the heat sink that is encircled in FIG. 1 and with the broken line forming no part of the claimed design; and,

FIG. 9 is a top view of the element of the heat sink that is encircled in FIG. 4 and with the broken line forming no part of the claimed design. 

CLAIM The ornamental design for a heat sink, as shown and described. 